/**
 * Created with IntelliJ IDEA.
 * User: Hkkkk Guo
 * Date: 2023/2/11
 * Time: 14:15
 * Description:
 */
package com.hangkai.reggie.controller;

import com.hangkai.reggie.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

/**
 * 文件的上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public Result<String> upload(MultipartFile file){
        //file是一个临时文件 需要转存到指定位置 否则本次请求完成后文件会被删除
        log.info(file.toString());

        //获得原始文件名
        String oName = file.getOriginalFilename();

        //获得原始文件名的后缀
        String last_name = oName.substring(oName.lastIndexOf("."));
        String fileName = UUID.randomUUID() + last_name;

        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()){
            dir.mkdirs();
        }

        //使用UUID生成新的名字 防止原始文件被覆盖
        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath + "\\" + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return Result.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //输入流,通过输入流读取内容
            FileInputStream ins = new FileInputStream(basePath + name);
            //输出流 通过输出流写回浏览器
            ServletOutputStream outs = response.getOutputStream();
            //设置响应格式
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = ins.read(bytes)) != -1){
                outs.write(bytes, 0, len);
                outs.flush();
            }
            //关闭资源
            ins.close();
            outs.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
